java dom4j创建 ，修改 ，删除 xml文件内容

 

 

import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import org.dom4j.Attribute; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; import org.junit.Test; public class writer3 { @Test

/**
创建xml 节点信息

*/ public void modify1(){ Document doc=DocumentHelper.createDocument(); Element rootelem=doc.addElement("contactList"); Element contactelem= rootelem.addElement("contact"); contactelem.addAttribute("id","001").addAttribute("name","eric"); //直接在节点上写入属性值 contactelem.addElement("name").addText("张三"); //增加标签 name 内容是文本 contactelem.addElement("age").addText("20"); //增加标签 age 内容属于文本 //无论 是创建 ，修改，还是删除后都要 写出到文件中 FileOutputStream out=new  FileOutputStream("e:/contact2.xml"); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("utf-8"); XMLWriter writer= new XMLWriter(out,format); writer.write(doc); writer.close();

 

创建效果如下：

<?xml version="1.0" encoding="utf-8"?>

<contactList> 
  <contact id="001" name="eric"> 
    <name>jimi</name>  
    <age>20</age> 
  </contact> 
</contactList>

 

 

修改代码段：

 @Test public void modify3() throws Exception { //修改就这三行代码 Document doc= new SAXReader().read(new File("e:/contact2.xml")); Element name=doc.getRootElement().element("contact").element("name"); name.setText("jimi");

 FileOutputStream out = new FileOutputStream("e:/contact2.xml"); OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("utf-8"); XMLWriter writer = new XMLWriter(out,format); writer.write(doc); writer.close(); }